Magic mushrooms grow everywhere and seem to be quite commonly taken for pre-Christian ceremonies all across the world.
I’d assume the people of medieval Europe, for instance, would know what these mushrooms were (or would be unexpected reminded when someone picked the wrong one).
Are there any recorded cases of people taking them on purpose?
Eh, difficult. More can always be said on the matter, so if anyone else would like to go at pre-modern psychedelic use, please don't hesitate to write up your own posts!